If your system is backward compatible with older versions of Security Center that do not support the Transport Layer Security (TLS) protocol (5.4 and earlier), your system will be more vulnerable to network attacks.
Mobile
Server 4.0 does not support
Transport Layer Security (TLS) protocol. Disabling backward compatibility means that the
Mobile apps and the Web Clients 4.0 can no longer connect to Security Center. Expansion servers that have not been
upgraded to version 5.5 or later will also stop working. Both Web
Client 4.1 and the role-based Web
Client 5.6 and later support TLS.